Toll-telephone system.



E. P. BAIRD.

TOLL TELEPHONE SYSTEM.

APPLICATION FILED JULY 12, 1902. RENEWED MAR. 10,1906.

Patented Aug. 10, 1915.

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Edward ZLBQLE'd,

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COLUMBIA PLANDCIRAFN CO WASHINGTON. D. C.

E. P. BAIRD.

TOLL TELEPHONE SYSTEM.

APPLICATION men JULY 12. 1902. RENEWED MAR. I0. 1906.

. 1 1 4 9 6 1 4. r Patented Aug. 10, 1915.

4 SHEETSSHEET 2.

E. P. BAIRD.

Y TOLL TELEPHONE S-YSTEM.

APPLICATION FILED JULYIZ, 1902. RENEWED MAR. 10, 1906.

1,149,614. Patented Aug. 10, 1915.

4 SHEETS-SHEET 3.

COLUMBIA PLANOORAPH 60., WASHINGTON, D. c.

E. P. BAlRD.

TOLL TELEPHONE SYSTEM.

APPLICATION FILED JULY 12. 1902. RENEWED MAR. 10. 1906. 1,149,614.

Patented Aug. 10, 1915.

jar/(REIT .Fdwani 1 1541;??? 17rd fi erhciu Wilmacoummm PLANQGRAPH c0.,WASHINGTON, n c.

, o STATES curios.

EDWARD r. BAIRD, ornvaivsr'oiv, ILLrNoIs; assreivorlmo iarrsnMANUFACTURING ooMrANY, or CHICAGO, ILLINOIS, ACORPO'R'ATIONDF ILLftioIs.

TOLL TE'LEPHONE SYSTEM.

Specification of Letters Patent.

Patented Aug. 1 0, 1915.

Application filed July 12, .1902, Serial No. 115,273. Renewed March 10,1901;. Serial No. 305,308.

tems, and more particularly to those systems.

for the use of which a toll is charged, as distinguished from those forwhich a periodical rental is paid.

It is now common practice to associate devices known as fregisters. andas tollreceivers, with telephone-systems. toll-receivers are employed,the deposit. of a coin is required before the service desired is given.IVhen a register is employed the register records each use of thetelephone and tolls in accordance with the record of the register, arepaid periodically. In some of the systems now in use, it is customary topermit the patron to call central ofiice without prepayment of toll. henthe central operator has ascertained that the desired service can begiven, the patron deposits a coin into the toll-receiver, or operatesthe register, and by a distinctive signal the central operator isnotified of such operation. An objection to this system is that thecentral operator is obliged to wait until the patron has performed suchoperation, and furthermore, thecalled subscriber is also obliged to waituntil the central had made connection between the substations,

after notification by the distinctive signal.

In another type of to'll-telephone-systems, prepayment or operationof"the register is necessary to permit the actuation of the cellsignal atthe central office, so the exchangeoperator is not obliged to wait forthe patron to deposit a coinor operate the'regist-er. In such system,means were usually provided whereby the coin could be refunded, ineventthe desired service could not be given. When 'a register wasemployed with such system, it was necessary to provide means whereby thepatron is credited with a call or means whereby the register could bereversely operated. When toll-receivers areemployed, the coin issometimes placed beyond control of the patron by the central operatorand in another system, such displacement of the coin is efiected by. thepatron, and the central operator is When notified of the withdrawal by asignal. In

A .desideratuni in the operation of toll telephone systems has been toprovide a system in which nov operation or action by the centraloperator is necessary which results in delayed service and in which theoperation by the central-operator is similar to that necessary insystems with which no toll-apparatus is associated.

A resultantadvantage of such system, is that no additional service bythe operator is necessary andthe association of the tollapparatus withthe line does not result in any delayin-the service. Furthermore, in anyexchange including terminals of toll telephone-lines and lines paid forby subscription, the operations, in so far as the eX- change-operator isconcerned, are identical and no confusion will arise.

One object of the present invention is to provide a toll-telephonesystem, in which the necessity of the controlof the toll-apparatus bythe central operator is avoidedin which thenecessity of waiting for asignal is avoided, andin which no delay in the service is occasioned bythe toll-apparatus and the operation thereof.

Another object of the invention is to provide an improvedtoll-telephone-system, and the invention also designs to improve theconstruction arrangement and operation of apparatus associated withtoll-telephonelines.

The invention consists in the several novel improvements and featureshereinafter set forth and more particularly defined by claims at theconclusion hereof.

In the drawings: Figure 11 is a diagrammatic view of a, tGIQphOIlGSYStQIII embodying the invention. Fig. 2 is a view in central verticalsection of a toll-apparatus which is associated with the telephone-line.Fig. 3'isa plan view of the toll-apparatus, theinclosin'g case beingshown in section. Fig. 4 is a vie-w in vertical section taken on line 41of Fig. 3. Fig. 5 is a detail view showing the means for securing thecoin-distributer-mechanism and preventing withdrawal of a depositedcoin. Fig. 6 is a detail view in side elevation of a portion of theframe and the parts secured thereto. Fig. 7 is a detail view inhorizontal section taken on line 77 of Fig. l. Fig. 8 is a detail viewin verticalsection taken on line S8 of Fig. 7. Fig. 9 is a view invertical section taken on line 99 of Fig. 3.

Referring more particularly; to Fig. 1 of the drawings, A and A denotesubstations connected with a central exchange B by telephone-lines. Eachsubstation is provided with a telephone-set comprising a receiver C, atransmitter D, switch-hook E, a callsignal F of usual construction andother usual parts as well understood in the art. Each telephone-lineincludes a branch conductor a extending from a contact-spring b. ofspring-jack Z) of a switch-board at the exchange to the substation, andterminates there in a contact adjacent switch-hook E.

Each telephone-line also includes a branchconductor a, extending from acontactspring 6 of the spring-jack of the switchboard to the substationand terminating there in a contact-spring g of a coin-controlled switchG of the toll apparatus. Transmitter D at each substation is included ina branch a of line-conductor a and a retardation-coil a is also includedin said conductor. Receiver G is included in a branchconductor aextending from line-conductor a and terminating in acontact atswitchhook E. A conductor a extends from the switch-hook to acontact-spring g of switch G of the toll-apparatus. A contact-spring gis arranged in position to be engaged by contact 9 of switch G and isconnected with ground by a conductor Switch Gr is controlled bymechanism hereinafter described. Call-signal F is included in aconductor f which bridges the line-conductors a and a and areleasing-relay H of the toll-apparatus is included in conductor f sothe relay will be energized when the call-signal is actuated.

Switch G and the several contacts thereof are arranged so thetelephone-line will be normally closed, thereat, and so communicationcan be interrupted, and also so one branch of the line can be groundedto provide a circuit for telephonic communication between the substationand centraloii ice, but which will not permit communication with anothersubstation until the coin-controlled switch has been again shifted bythe depositor. When contacts 9 and g are in normal or closed positionthe line will be in condition for telephonic communication with adistant station when proper connection is made at the exchange.In-coming calls are usually furnished without charge, and thetelephone-line is normally in condition to permit the telephone to beused without shift of switch Gr when the call originates at anothersubstation. -When contact 9 is held in engagement with grounded spring 9(by means hereinafter described) a grounded circuit is establishedwhereby communication for speech-transmission is established between theexchange and the substation and whereby communication between twosubstations will be interrupted until the coin which has been depositedto effect the actuation of the linesignal, is placed beyond control ofthe depositor. When contact 9 is between springs g and g and out ofcontact therewith, (which position is assumed when the deposited coin iswithdrawn), the telephoneline is open at switch G and the line isinoperative for speech transmission.

Central-exchange B is equipped with a cord-loop I comprising usual plugs2', 2", a centralized battery and a combined listening and ringing-key2, which are electrically connected by conductors in manner shown. Thecord-circuit includes also a key-switch J comprising normally closedcont-acts j and j interposed in a conductor 6*, extending from battery2' to the tip of plug 2'. A grounded conductor y' has a contact-terminalin position to connect spring with ground. A conductor 2' extends fromthe other side of battery 2' to the sleeve of plug a' and normallyclosed contact-springs 7' and 7' are included in such conductor. Aconductor 9' having a contact-terminal arranged to be engaged 137spring-contact is connected with a battery K which is grounded as at is.

The operators telephone-set M is connected as shown and in usual mannerwith key A section m of an induction-coil is interposed in conductor 7'and a coil m is correspondingly arranged in a branch-conductor m whichis also connected with the 0perators telephoneset M as shown. Thepurpose of providing key J and the associated connections is to providea circuit over which telephonic-communication can be had between theexchange and the substation and from which the other side of thecordcircuit or the other cord-plug will be excluded. Listening-keypermits the operator to connect telephone M with the line in usual.manner and without interrupting communication between the substations.

A line-signal L oi usual construction is included in a conductor Zextending from ground to battery K and thence to a contactterininalnormally engaged by one of the contact-springs of spring-jack b and isarranged to be disconnected therefrom when a plug is inserted into thejack.

The apparatus associated with the improved system is illustrated moreparticularly in Figs. 2 to 9 inclusive. A case 15 '11, by a spring 82.

of any suitable construction and having an open back and containing thetoll-device and parts operated and controlled thereby is usually securedto the back-board of a telephone, so audible signals (if any are used)produced by the toll-apparatus will be conducted over the telephone-lineto the central-exchange. Vithin the case, a compartment or receptacle 16retains the collected coins and a door 17 secured by a lock 18 permitsremoval of the coins by authorized persons. The operating-mechanism ofthe toll-device is sustained by a support or frame comprising side-walls20 and 21, secured to a horizontal wall 19.

A coin-receiving slot 22 is formed in the top-wall of the case. Amanually-actuated coin-carrier 1a is pivotally sustained by a rod 2aheld in the walls 20, 21 of the frame. Coin-carrier 1 1 is normallyinclined and is provided with a coin-channel 18 extending entirelytherethrough, and with a lever 25 extended through a slot 26 in thecase. A stop 27 located in coin-channel 13 holds a coin of proper sizein the carrier, while a coin of smaller size will pass therethrough, andinto coin-compartment 16. A notch 28 formed in the carrier and adjacentthe front or upper edge thereof, exposes a portion of a coin forengagement with the coin-controlled mechanism hereinafter described.

The distal terminal of lever 25 is located outside of the case, so thedepositor can shift the carrier. Lever 25 is provided with wings 29,which obstruct lever-slot 26 and prevent the insertion of articlestherethrough, and also obstruct the receiving-slot when the carrier isnot in normal position. Coins are positivelv shifted by the carrier toeffect positive shift of the coin-actuated or controlled parts of thetoll-apparatus.

A spring 30 imparts reverse movement to the coin-carrier and retains thecarrier normally in position to receive a coin inserted through thereceiving-slot 22. A dog 31, pivotallv sustained by a cross-rod 32, isprovided with a series of teeth, and is pressed normally into positionshown in rig. 2, and into the path of travel of a coin in carrier Theteeth of dog 81 are engaged by the coin during the descent of thecarrier and prevent retraction of the carrier, until the carrier andcoin have passed below the dog and the coin has been discharged. Spring32 engages dog 31 and holds an extension of dog 31 against stop 34-which is secured to wall 20. A coin discharged from the carrier willgravitate into a distributer-1nechanism, being directed thereto by aguide or wall 35.

The apparatus is designed to require the deposit of a coin before theline-signal at the central station is actuated, and to rebe given. Acoin-distributing-mechanism is provided whereby a coin will betemporarily retained and whereby the coin will be dis placed intocompartment 16 or refunded to the depositor. Thecoin-distributer-mechanism (see Fig. 2) comprises a chute 50 pivotallysustained at 51 in the side-walls of the frame, and a coin-rest 52positioned normally beneath the chute, and sustained by arms 53pivotally sustained at 54. passage 55 at the rear of rest 52 directs acoin into coin-compartment 16, when chute 50 is shifted to displace thecoin. 1f desired, an opening and translucent plate 12 may be provided todisplay a coin held in clrute 50, so a bogus coin can be detected. Aguide 56 beneath rest 52 directs a coin from chute 50 (when rest 52 isshifted) through an exit 57 and into a receiver 58, secured to theoutside of the front wall of the case.

A spring 59 retains chute 50 in normal position above rest 52 (see Fig.2). Displacement of a coin into coin-compartment 16 is effected manuallyby the shift of the carrier during the transit of the next depositedcoin to the distributer-mechanism, 6., a deposited coin for whichservice has been given remains in the distributer-mechanism untilanother coin is deposited, and during the transit of the latter coin tothe distributer-mechanism the previously deposited coin will bedisplaced into coin-compartment 16. The mechanism for shifting thecoin-chute to displace a coin into coincompartment 16 comprises abell-cranklever sustained by a cross-shaft 37 and having an arm 61extending normally into the path of movement of a coin in the carrier,and an arm 62 engaging a slightly flexible extension or strip 63,secured to distributerchute 50. Arm 61 is engaged by a coin during theinitial part of the downward shift of coin and carrier.

The operation of the mechanism for displacing coins into thecoin-compartment, will be as follows: A coin held in the carrier will,during the initial part of the shift thereof, engage arm 61 and shiftarm 62 of the bell-crank-lever, and swing the chute rearwardly againstthe force of spring 59, and into position to remove thepreviouslydeposited coin (if any) from rest 52 into passage 55 and thence into thecoin-compartment. As the coinin the carrier engages arm 61 only duringthe initial part of the downward movement of the carrier, arm 61 will bereleased and spring 59 will restore distributer-chute 50 to normalposition before the coin is dischargedfrom the carrier. During eachdeposit of a coin, and its transit to the distributer-mechanism, thedistributer-mechanism will be operated to displace a previouslydeposited-coin (if any), into the coin-compartment, and thedistributer-chute will be restored to normal &

position in readiness to receive the last deposited coin. A coininserted by a depositor desiring service, will be retained in thedistributer-chute. If the desired telephonicconnection is made, the coinremains in the distributer-chute and is secured therein againstwithdrawal by means hereinafter described, until displacement into thecoincompartment by the succeeding operation of the carrier.

A shifter-arm 36 projecting normally into the path of travel of a coinin the carrier, is secured to cross-shaft 37. Shaft 37 extends throughside-wall of the frame, and has secured thereto, a switch-arm 38 ofinsulating material. Switch-arm 38 engages spring-contact g of switch Gand controls the position thereof. When switcharm 38 is shifted by acoin, the arm will cause spring 9 to engage contact-spring g andcomplete a signal-circuit wherein the line-signal is included. A. latch44 pivotally sustained at 45 is provided with a hook 46 which isarranged to engage an inwardly projecting stud 47 of a lever 39 and toretain said stud, lever 39, switch-arm 38 and contactspring g in shiftedposition to cause or permit the actuation of the linesignal. Latch 44 isprovided with a camedge 44*, whereby the latch will be lifted by stud47, as the stud is shifted into position to retain the stud and lever39. Latch 44 is also provided with a notch or hook 44', which ispositioned to hold the stud in such position that contact-spring 9 willbe held between contacts g and g and out of contact therewith. Thetelephone-line will then be interrupted or open at switch G and will beinoperative. The switch assumes such intermediate position uponwithdrawal of a coin which has been deposited to cause the actuation ofthe linesignal at the central office.

The manually operated mechanism for effecting withdraw'al of a coincomprises a rod 64 mounted in manner free to slide in lugs 65 and 66 ofthe frame, and a handle 67 secured to the front terminal of rod 64, andwhereby the rod may be shifted. A lever 68 pivotally sustained as at 71and having its lower end connected by a stud and slot 70 to one of thearms of the movable coin-rest 59., serves to effect the shift of saidcoin-rest when rod 64 is shifted forwardly. A spring 68* restores lever68 and connected parts to normal position after shift thereof. Rod 64 isfree to be shifted forwardly and backwardly of the normal position seenin Figs. 4 and 8, and is yieldingly held in normal position and restoredthereto, after shift in either direction by a centralizing spring havingeach of its free terminals engaging a stud 64, projecting inwardly fromrod 64 (see Figs. 7 and 8).

A locking-dog 72 is pivotally sustained in the frame as at 73 andsecures lever 68 against shift in that direction in which withdrawal ofthe coin is effected. An arm 87 of dog 7 2 is arranged to obstruct thepath of movement of the upper end of lever 68, and thus prevent shiftthereof. An arm or extension 79 of dog 72 is arranged to be en gaged andlifted by stud 47 of lever 39 to effect the shift of arm 87 of the dogout of the path of movement of lever 68 when a coin is to be withdrawn.Such means also retains the locking-dog in position to re lease lever 68while the coin-controlled switch G is in position to cause actuation ofthe line-signal. Arm 79 of dog 7 2 is formed to permit the dog to passinto locking-position when stud 47 and switcharm 38 are either in normalposition or in intermediate position and so the coin can only bewithdrawn while the switch is in position to cause actuation of theline-signal. Rod 64 is provided with studs 75 and 76 guided in slots 77,formed in side-walls 20 of the frame and in a plate 78 secured to lugsand 66 of the frame. Stud 75 projects inwardly and is positioned toengage and shift the upper terminal of lever 68 of the coin-rest. Stud76 projects outwardly and through a cam-slot formed in latch 44. Saidslot is formed with an angular portion 44 which will cause the latch tobe lifted a sufficient distance to release stud 47 and permit said studand switch G to be restored to normal position when rod 64 is shiftedinwardly. An abutment 44 is also formed in the camslot and causes latch44 to be lifted sufficiently to permit stud 47 to pass into and bearrested by notch 44 of the latch, and so the stud will cause contact 9of switch G to be held in its intermediate position and out of contactwith springs g and 9 when rod 64 is shifted forwardly to withdraw adeposited coin.

Lever 39 is provided with a hammer 43 which engages a gong 42 andproduces an audible signal which is conductedover the telephone-line tothe central-operator upon release of stud 47 by the latch when thedepositor shifts rod 64 to place the coin beyond his control. Suchsignal is produced simultaneously with the release of switch G intoposition to render the telephonelinc operative between the substationsand after con nection has been established at the central exchange.

Releasing-relay H comprises an armature h secured to latch 44. \Vhen thehelix of said relay is energized, latch 44 will be shifted to free stud47 from latch 44 and permit switch G to restore the telephone-line tonormal condition. Such shift of the latch is only necessary when thepatron does not obtain the service desired, and withdraws a depositedcoin. Relay H is included inthe bridge-circuit f in which. thecall-signal F is included, so the telephone-line will be automaticallyrestored to normal condition in readiness for an in-coming call. If theswitch G remains in its intermediate position when a connection is againdesired, the shift o-f'the coin-carrier will shift the switch intoposition to close the signal circuit from the intermediate position.

The operation of the improved telephonesystem and toll-apparatus will beas follows: Assuming the line to be in normal condition (out of use) andthe toll-apparatus in norinal position shown in the drawings, a patrondesiring a telephonic-connection will deposit a coin of properdenomination into the toll-receiver. The deposited-coin will pass intocoin-carrier 1% and the depositor will next shift the carrier todischarge the coin into the distributer-mechanism. In transit to thedistributer, the coin in the carrier will operate the distributor-chute50 and displace a previously deposited coin (if any) into compartment16, as hereinbefore described, and also engage arm 36 and rock shaft 37,

. and shift lever 39 in position to be held by hook d6 of latch a l.Switch-arm 38 will then be in position to hold contactspring g incontact with spring 9 and complete a grounded circuit for the actuationof the line-signal at the central ofiice, to notify the central-operatorof the deposit of a coin and that service is desired. Vhen the depositedcoin is held in the distribliter-mechanism and lever 39 is in saidshifted position, stud 17 will engage arm 79 of locking-dog 72, and holdsaid dog in lifted position, so lever 68 of the distributer will be freeto be shifted by rod 64E. Therefore, if the telephone-line is out oforder, so central-oflice cannot be colnnninicated with, the depositorcan withdraw the coin. When switch G has been shifted by a depositedcoin and the coin has been displaced into the distributer chute, theline-signal will be actuated by passage of current over a circuit, asfollows, viz: ground at L", at central office, to battery K, conductor Zwherein linesignal L is included, contactspring 6 of spring-jack Z7,line-conductor a, centact-springs g and g of switch G, and conductor 9to ground. Line-signal L being then actuated, the central-operator willbe notified that a coin has been deposited in readiness to be placedbeyond control of the depositor, and that a connection is desired.Thereupon the centraloperator will insert answering plug 2' intospring-jack 6, thus excluding the line-signal from line, and will alsoshift key J to establish communication with the subscriber. lVith saidkey in shifted position and plug 6 in springjack Z), circuit fortransmission of speech between the calling substation and central ofiicewill be established as follows, viz: ground 70, conductor Z, battery K,inductioncoil m, conductor 3' spring 3' of key-switch J, conductor 2'the sleeve of plug 2', spring 6 0f spring-jack b, lineconductor a,branchconductor a, in which receiver 0 is included, switch-hook E,conductor a, spring 6' of spring-jack Z), the tip of plug 71, conductor6*, spring j and conductor to ground. Current also passes throughbranch-conductor (4 in which retardationcoil (0* and transmitter D areincluded, springs g and g of switch G, and conductor 9 to ground. Thecentral-operatoi"s telephone M will then be in communication with thesubstation by induction-coils m, m and conductor m as well understood inthe art. The central operator can then ascertain from the depositor theconnection desired and next the operator ascertains whether or not thedesired service can be given, in usual manner. If the desired servicecan be given, central operator inserts plug 2" of cord-circuit 1 intothe spring jack of the called substation and operates ringing-key i aswell understood in the art and thus notifies the called substation, andrestores key-switch J to normal position. No further action is necessaryupon the part of the central op erator. Furthermore, it is not necessaryfor the central operator to wait until the person at the called-stationresponds. Nor is it necessary for the central operator to remain uponthe line to ascertain whether or not the depositor places the coinbeyond his control, because the telephone-line is not placed incondition to establish complete telephonic-communication between the twosubstations until the depositor places the coin beyond his control. Whenthe person at the called substation responds to the call, such responsecan be heard by the person at the calling-station but the person at thecalling substation cannot communicate with the person-at the calledstation because the transmitter of the telephone-set at the substationat which the call originates is excluded from the circuit. The circuitwhereby the person at the calling station will be informed of theresponse to the call of the person at the called station will be asfollows, viz: Current will pass from the centralized battery 2'conductor 2', springs and j*, of keyswitch J, conductor 2', sleeve ofplug 2', spring b of spring-jack b, line-conductor a, conductor awherein telephone-receiver C is included, switch-hook E, line-conductora, spring Z) of spring-jack b, the tip of plug d and conductor 2',wherein springs j, y" are contained, back to battery 71.

It will be understood that the circuit for speech transmission betweenthe called station and the central office will be complete. Thetelephone-transmitter at the calling-station being excluded from theline, prevents the transmission of speech from the calling station tothe called station. As seen however, as the depositor hears the responseof the called station through receiver C, he will know that connectionhas been made as desired, and will thereupon push rod 64 inwardly toplace the coin beyond his control, and to complete the circuit forspeech transmission between both substations. Inward shift of rod 64will cause stud 76 to engage inclined portion 44 of the cam in thelatch, and lift said latch to eifect the release of stud 47, lever 39and switch-arm 38. Stud 47 will then return to normal position andlocking-dog 72 will thereupon be released and again secure lever 68against shift thereof, to effect withdrawal of the coin. Simultaneously,switch-arm 38 will pass into normal position and permit the spring 9 ofthe coin-controlled switch to engage spring 9 and restore thetelephone-line to normal condition. Current for the transmission ofspeech from the calling station will then pass also through conductor ain which transmitter D is included, springs g, g of the coin-controlledswitch, conductor a, and switch E to line-conductor a. The transmitter Dat the calling substation then will be operative for the transmission ofspeech.

Thus it will be seen that the completion of the circuit forspeech-transmission between the two substations is dependent upon thedeposit of a coin or placing of a coin beyond the control of thedepositor. Furthermore, it will be seen that the coin controlled-switchserves as an interrupter for the line employed for speech-transmission,which can be shifted to place the telephone-line in condition for speechtransmission between the two substations at the will of the depositor.Furthermore, it is manifest that the central operator is not delayed atany time by the necessity of waiting for the depositor to shift thecoin-controlled switch, or even until the called subscriber responds tothe call, because the calling-subscriber is informed of the response ofthe called station through the telephone-receiver.

The purpose in providing a confirmatory audible signal is to providemeans for pro tecting the use of fraudulent means to establish theground necessary at the substation to effect the actuation of theline-signal at 7 central oiiice. Ordinarily, the central operator willrely upon the coin-controlled switch, but if at any time the operator isat leisure and desires to verify the operation of the coin-controlledswitch, and the position of the coin beyond the control of thedepositor, such can be done by employing the usual listening-key i Thislistening-key permits the central operator to listen upon the line inusual manner and can hear the audible signal produced by hammer 43 andgong 42, upon release of the spring 9 of the V coin-controlled switch,and the restoration of such spring to normal position which as includingany restricted to the occurs at the time the deposited coin is lockedinto the distributer-mechanism. For example, if the ground had beenestablished by fraudulent means, at the substation, the confirmatoryaudible signal would not be heard by the central operator who would thendetect the fraudulent operation.

If the service desired by the depositor at the substation cannot beobtained or the desired service cannot be given, the central operatorwill inform the depositor either orally or by busy signal, as wellunderstood in the art, that the desired connection cannot be obtained.The depositor will thereupon pull rod 64 outwardly. Such shift willcause stud 76 to engage abutment 44 lift latch 44 a sufficient extent tocausestud 47 of lever 39 to pass into hook 44 of the latch. The forwardshift of the rod will cause stud 76 to engage lever 68 which will shiftcoin-rest 52 backwardly, so the deposited coin will gravitate and bedirected into receiver 58. hen stud 47 is held in hook 44 of the latch,spring 9 will be held between springs g and g and out of contacttherewith, so the telephone-line will be inoperative either for speechtransmission or operation of the line-signal. As a result the depositorcan obtain no further communication with central office until a coin has6 again been deposited. If the next time, the

telephone is to be used, no call has originated at the substation, thelatch and switch G will be restored to normal position by the actuationof the call signal. Current employed for operating the call-signal willpass from one of the line-conductors, through the call-signal andthrough the helix of releasing-relay H, and thence re turn to centraloilice over the other branch conductor of the telephone-line. Thus itwill beseen that when the telephone-line is left in inoperativecondition, it will be automatically restored to condition for thetransmission of speech upon the actuation of the call signal.

The term coin as used herein, is not to be understood as including onlycoins, but toll-representing-token which may be employed in lieuthereof. lVhile a toll-receiving apparatus has been shown and describedas a part of the telephone-system, certain generic features of theinvention may be readily employed in toll devices in which a token isnot deposited, but in which the actuation of the switch or other means,is effected either by a toll-device or a register or recorder, andunless specifically restricted in the claims, these features are not tobe understood as restricted to a system in which atoll-receiving-apparatus is employed.

The invention is not to be understood as details of construction shownand described, but may be employed within wide limits without departingfrom the spirit of the invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. In a toll-telephone-system, the combination with a central-exchange,a substation and a telephone-line extending therebetween, saidsubstation including transmitting and receiving instruments, of meansfor rendering both of said instruments operative forspeech-transmission, between the calling station and the exchange aswitch and connections in the main line at the substation for renderingone of said instruments inoperative for speech-transmission between thecalling station and the called station independently of the otherinstrument, and a toll-device to which said switch is connected torender the inoperativ'e instrument operative for speech-transmission.

2. In a toll-telephonesystem, the combination with a central-exchange, asubstation and a telephone-line extending therebetween, said substationincluding transmitting and receiving instruments, of a switch at thesubstation held normally in position to close the line, means at thesubstation for causing said switch to render one of the I instrumentsinoperative for speech-transmission between the-calling and :1 calledstation independently of the other of said instruments when said switchis in one position, means at the substation for holding said switch tointerrupt the passage of current through one of said instruments whensaid switch is in another position and a toll-device for controllingsaid switch.

3. In a toll-telephonesystem, the combination with a central-exchange, asubstation and a telephone-line extending therebetween, said substationincluding transmitting and receiving instruments, of a switch at thesubstation hcld normally in position to close said line, means at thesub-station for rendering the transmitter inoperative forspeech-transmission between the calling and the called stationindependently of the receiver, when said switch is in one position, meanat the substation for holding said switch to interrupt the passage ofcurrent through one of said instruments when said switch is in anotherposition, and a toll-device controlling the operation of said switch.

l. In a toll-telephone-system, the combination with a central-exchange,asubstation and a telephoneline extending therebetween, said substationincluding transmitting and receiving instruments, of a line-signal atthe exchange, a switch located at the substation and connected with saidline, means at thesubstation for shifting said switch to establish acircuit which will cause actuation of the line-signal, means at thesub-station for rendering the transmitter inoperative forspeech-transmission between a calling station and a'called stationindependently of the receiver, and a toll-device controlling theoperation of said switch and said means.

5. In a toll-telephone-system, the combi nation with a central-exchange,a substation anda telephone-line extending therebetween,

said substation including transmitting and I'8C61V1I1g instruments, of aline-signal at the central o'tlice, a switch located at the centralofiice, a switchlocated at the substation and connected to said line,means for establishing a circuit to render both of said instrumentsoperative for speech-transmission between the exchange and thesubstation, means for rendering one of said instruments inoperative forspeech-transmission between a calling station and a called stat-ionindependentlyof the other of said instruments when said switch is heldin one position, means located at the substation and whereby one of saidinstruments will be rendered inoperative when said switch is held inanother position, and a toll-device controlling the operation of saidswitch, and all of said means.

6. In a toll-telephone-system, thecombination with a central-exchange, asubstation and a telephone-line extending therebetween said substationincluding transmitting and receiving instruments, of a line-signal atthe central-exchange, a switch located at the substation connected withsaid line, means whereby said switch will be held no 'mally in positionto close said line, means whereby said switch may render one of saidinstruments inoperative for speech-transmission between a calling and acalled station independently of the other of said instruments when saidswitch is held in one of its positions, means whereby said switch may beheld to interrupt the passage of current through one of said instrumentswhen said switch is held in another position, and a toll-devicecontrolling the operation of said switch and all of said means.

7. In a toll-telephonesystem, the combination with a central-exchange, asubstation including transmitting and receiving instruments and atelephone-line extending therebetween, of a line-signal at thecentralexchange, aswitch located at the substation and connected to saidline, means for shifting saidswitch to establish a circuit which willcause actuation of the line-signal, means whereby the central-operatorcan establish a circuit through both of said instruments forspeech-transmission between the central-exchange and said substationwhile aid switch is in positiontocause actuation ofthe linesignal, meansfor rendering one of said instruments inoperative forspeech-transmission between a calling and a called station independentlyof the other of said instruments, and a toll-device at the substationfor operating said switch to restore it to normal position to establisha circuit which renders both of said instruments operative for thetransmission of speech.

8. In a toll-telephone-system, the combination with a central-exchange,a substation including transmitting and receiving instruments and atelephone-line extending therebetween, of a line-signal at thecentralexchange, a switch located at the substation and connected tosaid line, means for shifting said switch to establish a circuit whichwill cause actuation of the line-signal, means whereby the centraloperator can establish a circuit through both of said instruments fortransmission of speech between the centralexchange and said substation,while said switch is in position to cause actuation of the line-signal,means for rendering one of said instruments inoperative forspeechtransmission between a calling and a called station independentlyof the other of said instruments, means at the substation for restoringsaid switch to normal position to establish circuit which renders bothof said instruments operative for the transmission of speech, and atoll-device controlling the operation of all of said means.

9. In a toll-telephone-system, the combination with a central-exchange,a substation and a telephone-line extending therebetween, the substationcomprising transmitting and receiving instruments, of a switch at thecentral-exchange, a switch at the substation, means at the substationfor rendering one of said instruments inoperative forspeech-transmission between the calling and called station independentlyof the other, means at the central station for establishing a circuitfor the transmission of speech between the central exchange and thesubstation when the switch at the central-exchange is shifted, means atthe substation to place the line in condition to render one of the saidinstruments inoperative for the transmission of speech between thesubstations when the switch at the centralexchange is again shifted, anda toll-device controlling the operation of the switch at the substation.

10. In a toll-'telephone-system, the com bination with acentral-exchange, a substation including transmitting and receivinginstruments and a telephone-line extending therebetween, of a switch atthe substation, means at the sub-station for rendering the transmitterinoperative for speech-transmission between a calling and a calledstation independently of the receiver, a switch at the central-exchangeto establish a circuit for the transmission of speech between thecentrahexchange and the substation, and to place the line in conditionto render both of said instruments operative for the transmission ofspeech when the switch at the substation is shifted, and a toll-devicecontrollingoperation of the switch at the substation.

11. In a toll-teleph'one-system, the combination with a substation, acentral-exchange and a telephone-line, said substation includingtransmitting and receiving instruments, of means for rendering one ofsaid instruments inoperative for speech- EFELHSDHSSIOII between acalling and a called patron at the substation can restore thetelephone-line to condition to permit intercommunication between the twosubstations.

12. In a toll-telephone system, the combination with an exchange, asubstation including transmitting and receiving instruments, and atelephone line between the station and the exchange, of a toll device,means for preventing communication between the substation and theexchange by a subscriber at the substation until the toll-device hasbeen operated, and means at the substation for independently renderingone of said instruments inoperative for speech transmission between thecalling station and the called station, until said toll device has beenagain operated. i

13. In a toll-telephone system, the combination with an exchange, asubstation including transmitting and receiving instruments, and atelephone line between the station and the exchange, of a toll device,means for preventing communication between the substation and theexchange by a subscriber at the substation until the toll-device hasbeen operated, and means at the substation for independently renderingthe transmitter inoperative for speech transmission between the callingstation and the called station, until said toll-device has been againoperated.

FRED GERLAoI-I, EMMA GERLACH.

Copies of this patent may be-obtain'ed for-five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

